Pro*em"bry*o\, n. [Pref. pro- + embryo. ] (Bot.) (a) The series of cells formed in the ovule of a flowering plant after fertilization, but before the formation of the embryo. (b) The primary growth from the spore in certain cryptogamous plants; as, the proembryo, or protonema, of mosses.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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